What Does U0136 Mean?
Communication between the control module network and the Rear Differential Control Module has been interrupted. This module controls rear differential locking, limited-slip function, or electronic torque vectoring in AWD/4WD systems.
Common Causes
35%
Rear Differential Control Module failure or internal circuit damage
30%
Harness damage from road debris, heat, or fluid contamination
20%
CAN bus communication line fault or short circuit
10%
Module power supply interruption or voltage fluctuation
5%
Poor ground connection or high resistance ground path
Diagnostic Steps
1
Step 1: Inspect rear differential area for fluid leaks, physical damage, or connector exposure to elements
2
Step 2: Verify power and ground circuits at Rear Differential Control Module connector
3
Step 3: Check CAN bus communication lines for proper voltage and signal quality
4
Step 4: Perform resistance test on CAN High and CAN Low between module and network junction
5
Step 5: Clear codes and monitor for immediate return to determine intermittent vs. constant fault
Estimated Repair Cost
$200 - $1,700
Parts + labor, varies by vehicle and location
Communication between the control module network and the Rear Differential Control Module has been interrupted. This module controls rear differential locking, limited-slip function, or electronic torque vectoring in AWD/4WD systems.
The most common cause of U0136 (Lost Communication With Differential Control Module Rear) is: Rear Differential Control Module failure or internal circuit damage
Typical repair costs for U0136 range from $200 to $1,700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Rear differential control features will be disabled, potentially causing unexpected handling behavior. Traction control and stability systems may operate in degraded mode.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0136 to identify the root cause.
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Quick Info
Category
Network
System
Rear Differential/AWD System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
